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A10-4600 + Radeon 7670M discrete and GPU-z

Last response: in Graphics & Displays
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January 22, 2013 3:05:44 PM

Hello, everyone

Dual graphics question

I have a laptop with AMD A10-4600 CPU (7660G on-die GPU), as well as a AMD Radeon 7670 with 1 GB of GDDR3. Looking at GPU-z, I have 2 options for looking at the card(s).

1 - "7660G + 7600M", codename "Devastator" 32nm tech, 246 mm^2 die size, 1300 M transistors, 8 ROPs, 384 shaders, 5.5 GPix/s and 32.9 Gtex/s fillrates, 512 Mb DDR3 memory running at 800 MHz (RAM for the 7660D is pulled from the system RAM, and mine is 800 MHz, so that makes sense) at 128-bit and 25.6 GB/s bandwidth, and 686 MHz core clock.

2 - "7600M", which I am assuming the 7670M. Codename "Thames", 40 nm tech, 118 mm^2 die size, 716 M transistors, 16 ROPs, 480 shaders, 9.6 GPix/s and 14.4 Gtex/s fillrates, 1024 Mb of GDDR3 at 900 MHz and 128-bit bus, with 28.8 GB/s bandwidth, and 600 MHz core clock.

So, here's the question - how come I have almost double the pixel fillrate, but less than half the texture fillrate when I am running just the dedicated card compared to dual graphics? Is this because of the ROPs? Also, why does the X-Fire config show less shaders than the single? does it only show the lowest number of shaders (on the 7660G) and expect me to know that they are doubled through X-fire (hence the much higher texture fillrate)? Except that 7660G uses VLIW4 from 6900-seris , while the 7670M is still the old VLIW5 from the 5000-series.

What are some games I should run to see whether or not it makes sense to just use the 7670 and disable the onboard 7660D (I only play SC2 and Alpha Centauri on this laptop so far, with Catalyst 12.11 beta and CAP, I can play SC2 at 1080p with only minor stuttering in 4v4 battles). Seriously, GPU-z brought more questions than answers in this case.
January 22, 2013 3:16:04 PM

http://www.amd.com/us/products/technologies/dual-graphi...


I have bad news for you. Sorry...

You need to pair HD6xxx discreet graphics cards with AMD APUs, check the link I posted for compatibility.

So for your graphics to work in dual graphcis mode AMD suggests the HD6670, although the other HD6450 to HD6570 will work, it is not optimal.
Dual graphics will not work at all with HD7xxx.

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January 22, 2013 3:22:26 PM

Thanks for the reply Novuake, but the link in reply is for the desktops :D . Their notebook page shows 2011 on it, therefore limited to Llano APUs
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January 22, 2013 3:33:03 PM

Ah so its a laptop? My apologies.
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January 22, 2013 3:51:56 PM

you should ask GPU-Z's creator, W1zzard over at TechPowerup.com. That would be the best place to get a concrete answer and not assumptions.
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January 22, 2013 4:44:55 PM

Novuake said:
http://www.amd.com/us/products/technologies/dual-graphi...


I have bad news for you. Sorry...

You need to pair HD6xxx discreet graphics cards with AMD APUs, check the link I posted for compatibility.

So for your graphics to work in dual graphcis mode AMD suggests the HD6670, although the other HD6450 to HD6570 will work, it is not optimal.
Dual graphics will not work at all with HD7xxx.


That 7670m is a rebranded 67xx series and will work.

I would deactivate the hybrid crossfire because AMD drivers majorly suck for it and often you will get lower fps on certain games than just using the dedicated card.
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January 22, 2013 6:15:43 PM

I suggest that you reconsider instead of buying into an apu system with hybrid crossfire as you could build a much better system for the same costs. Hybrid crossfire is only meant for those who need this option for upgrading and in the mobile scene being able to switch the discrete gpu on only as needed.
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January 22, 2013 6:21:57 PM

nforce4max said:
I suggest that you reconsider instead of buying into an apu system with hybrid crossfire as you could build a much better system for the same costs. Hybrid crossfire is only meant for those who need this option for upgrading and in the mobile scene being able to switch the discrete gpu on only as needed.


He has a mobile system.
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January 22, 2013 6:29:59 PM

Novuake said:
He has a mobile system.


Still stands as people Google searching will come across this thread from time to time.
As for the mobile it does work but there are often driver related issues and in the long term the discrete gpu can fail but the IGP will contenue to work. By the way get K10Stat for tweaking the volts and clocks on the apu. What ram is installed? If it is 1333 instead of the prefered 1600 8gb kit you should upgrade due to the extra bandwidth that you will gain for the IGP (better fps). I once had a A8 3530MX Llano so I am not just some random jerk.
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January 22, 2014 6:22:15 PM

Lol, got an email today from Toms, thought I'd check back on the threads I've started.
I do have a 8GB DDR3-1600 CL9 RAM , since the laptop came with 6GB CL11 RAM, I thought it was funny that Samsung would cripple the APU so much by not enabling the dual-channel RAM on it. In fact, I had installed 8GB DDR3-1600 CL9 kit in the laptop before turning it on for the first time.

Hope I don't get flamed for resurrecting this zombie thread :D 
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